<template>
                <ul>
                  <li>Vue</li>
                  <li>news001 <input type="text"></li>
                  <li>news002 <input type="text"></li>
                  <li>news003 <input type="text"></li>
                </ul>
</template>

<script>
export default {
  name:'News',
  data() {
    return {
      opacity:1
    }
  },
  // beforeDestroy() {
  //    console.log('News组件即将被销毁了');
  //    clearInterval(this.timer)
  // },
  // mounted() {
  //   this.timer = setInterval(() => {
  //     console.log('@');
  //     this.opacity -= 0.01
  //     if(this.opacity <= 0) this.opacity = 1
  //   }, 16);
  // },
  activated() {
    this.timer = setInterval(() => {
      console.log('@');
      this.opacity -= 0.01
      if(this.opacity <= 0) this.opacity = 1
    }, 16);
  },
  deactivated() {
     console.log('News组件即将被销毁了');
     clearInterval(this.timer)
  },
}
</script>

<style>

</style>